This is certainly a strange one - now, I'm really curious to know how it all plays out.
I wish the authorities would just hoist the boat up. There has to be lots of clues onboard, unless items have been washed out to sea by now. Have they even sent a diver to check it out? In any event, if my calculations are correct, the 20 day waiting period is up next Monday (24th Nov) so hopefully some answers will be forthcoming soon.
It definitely doesn't sound like a joy trip, and I'm not thinking drug smuggling either, because of the entire family being onboard (but could be wrong there). I'm guessing they didn't even have a cell phone, or they would have called for help (or maybe they had one, but no place to charge it).
Why didn't one of the adults swim to shore earlier and get help? They were close to shore and the water was not very deep. They had to be running out of food, if the boat had been stuck there for days. The whole family would have been drowned if it were not for people spotting that they were in danger. It also appears the baby had stopped breathing, and would have died without intervention.
At the very least, they could have been charged with child neglect - maybe that's one of the reasons they took off.